Tolong yang no 4 bwt blajar uas trims

4.
x+y - m = 0
y = m - x
subke lingkaran
x²+y² -8x + 4y = 0
x² + (m-x)² - 8x + 4(m - x)= 0
x² +m² - 2mx + x² - 8x + 4m - 4x = 0
2x² + (-2m-12)x  + (m²+4m) = 0
b² - 4ac >  0
(-2m-12)² -  4(2)(m²+ 4m) > 0
4m² + 48 m + 144 - 8m² - 32 m  > 0
-4m² - 16 m + 144 >  0
m² -4 m - 36  > 0
(m -9)(m+5) >0

m > 9 atau  m  < -5
(Jawab D)